Are we going to adapt all the world's flora and fauna to the changed conditions too? If so it's simply cheaper to entirely fix global warming. If not, what are

Are we going to adapt all the world's flora and fauna to the changed conditions too? If so it's simply cheaper to entirely fix global warming. If not, what are we planning on eating? We're already seeing species can't react quickly enough to changing conditions. Flora especially takes time to move. If it's only humanity that is adapting, isn't the point rather moot?